The Late Devonian strata at Fecht area in the eastern Anti-Atlas,Morocco,North Africa,could be divided into two units:ds3 and dh.The ds3 unit is a set of gray with purple-red thick to thin layered nodular detrital limestone with a thickness of about 1.3m,where stromatolites are observed,rich in crinoid stems and cephalopods,and locally associated with brachiopods and trilobites.The lower part of the dh unit is an inter-bedded layer of gray thin layer of argillaceous siltstone and silty shale,mixed with muddy limestone lenses;the upper part is a gray-green medium layer of fine sandstone,with ripple structures and abundant trace fos-sils and bivalves.The conodont biostratigraphy indicates that both units should be located in the Early Palma-tolepis marginifera zone of the Famennian.This article reports on the stromatolites of the Late Devonian Famennian in Morocco for the first time,indicating that after the Frasnian-Famennian mass extinction,micro-organisms flourished first and then followed by the recovery of skeletal organisms.
关键词
叠层石/牙形石/法门期/晚泥盆世/小阿特拉斯东段/北非摩洛哥
Key words
stromatolite/conodont/Famennian/Late Devonian/eastern Anti-Atlas/Morocco,North Africa
维普
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